Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08b135059271191…

MALICIOUS

PDF

90.4 KB Created: 2021-07-16 10:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a605ef3174845a3f43c26ecea58c189 SHA-1: 8e3d54820f14367651725b70afae4265c6493a55 SHA-256: b08b1350592711914509523f234f9f76d40f79623aa428cce4b71f30c383234c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to serve further malicious content. No scripts were extracted, but the structure suggests a link farm designed to exploit search engine algorithms or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160724879d2a93---vomexapudukogedekalate.pdf
    • https://ancoraeducacion.com/images/fexuzivunapufibomonis.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/3ojh02egvbjb757b4h60gt32t0/59653568789.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/at9vk8aeumce0tsfhqh7dvlrrq/2790651898.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfdb71766---34018932748.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/43777834702ba108d8ea0f2acd327de7/54643253194.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/demumikuvepifidu.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2987813eb---84652223683.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/keausjsin174uo7ldh91m51uqj/30628805327.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/naxosekezotinosopeluvizo.pdf
    • http://www.specemc.ru/upload/files/32753644613.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b616a37bd9e---xonowatamuruvuzisupodalit.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/afb0ddcb1ab046d14c66a48ee0da2d67/fubekerani.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d011b379---fitazojetumakubedimowuv.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/280d410a2cf3a5716648d257c9eb6b26/13812733011.pdf
    • https://luminex.pl/upload/file/19125306951.pdf
    • http://churchtextile.com/userfiles/file/9181429347.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/815bb64ed75fa4e13ebc51c71bc16aef/15463330562.pdf
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/rowirunovugozotoba.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be0282c534d---34037197826.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070f68246411---wimawe.pdf
    • http://turar-mussin.com/userfiles/File/mujejajoxuzanila.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4f24bd6b70e708f6baf9e23640f6d593/tuzawamilin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gta+san+andreas+cheat+codes+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fec0.bin
fd3bb3d133803ffe232b2826d7073e940d236ac944f2bf802beed4771594031f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 17328 bytes
font_01_sfnt_off00012c22.bin
55ac8f81b2c6fa9f6befc30dbabf194642ff727a2506f9f8bbd1af8016ca5bcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 10564 bytes
font_02_sfnt_off00014436.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14436 16792 bytes